Here are a couple of paper buildings in the style of old school Warhammer fantasy.
Games Workshop’s Warhammer miniatures rules have been adapted to a wide variety of other periods. You can get the Warhammer ‘Nam rules by joining the Yahoo Group.
The Gemini rules for Warhammer 40,000 are essentially a set of house rules for Games Workshop’s flagship product.
I think that the author is correct in his premise — that the Rogue Trader rules were perhaps the best.
Death Squads is a set of rules for small scale skirmish conflicts in the 41st Millennium.
Here’s an impressive set of Flickr photos with atmospheric Warhammer 40K images.